When I use my living room floor which is carpeted, I pin the backing to the carpet using "T" pins which you can get at your quilt shop.
Then I lay the batting down. If the batting just came out of the bag I'll let it "rest" for a day or more or throw it in the dryer with a damp towel to relax it.
Then I lay the top down and use pins to hold the sandwich together.
With it all pinned together, you can then move it to your dining room table to tie it at a comfortable level.
As for SID quilting...try a placemat size sandwich and give it a try....much easier to practice and learn with.... :wink: